#pragma once
using namespace std;
#include<iostream>
#include<time.h>
#include<stdarg.h>
#include<sys/types.h>
#include<sys/stat.h>
#include<fcntl.h>
#include<unistd.h>
#include<stdlib.h>
#include<string>

#define SIZE 1024

#define Info 0
#define Debug 1
#define Warning 2
#define Error 3 
#define Fatal 4

#define Screen 1
#define Onefile 2
#define Classfile 3

#define LogFile "log.txt"

class Log
{
public:
    Log()
    {
        PrintMethod=Screen;// 默认输出到屏幕
        path="./Log/"; // 默认日志路径 
    }
    void Enable(int method)
    {
        PrintMethod=method;
    }
    string levelToString(int level)
    {
        switch(level)
        {
        case Info:
            return "Info";
        case Debug:
            return "Debug";
        case Warning:
            return "Warning";
        case  Error:
            return "Error";
        case Fatal:
            return "Fatal";
        default:
            return "None";
        }
    }
    void PrintLog(int level,const string &logtxt)
    {
        switch(PrintMethod)
        {
        case Screen:
            cout<<logtxt<<endl;
            break;
        case Onefile:
            PrintOneFile(LogFile,logtxt);
            break;
        case Classfile:
            PrintClassFile(level,logtxt);
            break;
        default:
            break;
        }
    }
    void PrintOneFile(const string &logname,const string &logtxt)
    {
        string _logname=path+logname;
        int fd=open(_logname.c_str(),O_WRONLY|O_CREAT|O_APPEND,0666);
        if(fd<0) 
        {
            perror("open: ");
            return;}
        write(fd,logtxt.c_str(),logtxt.size());
        close(fd);
    } 
    void PrintClassFile(int level,const string &logtxt)
    {
        string filename=LogFile;
        filename+=".";
        filename+=levelToString(level);
        PrintOneFile(filename,logtxt);
    }
    ~Log()
    {
    }
    void operator()(int level,const char *format,...)
    {
        time_t t=time(nullptr);
        struct tm *ctime=localtime(&t);
        char leftbuffer[SIZE];
        snprintf(leftbuffer,sizeof(leftbuffer),"[%s][%d-%d-%d %d:%d:%d]",levelToString(level).c_str(),
                 ctime->tm_year+1900,ctime->tm_mon+1,ctime->tm_mday,
                 ctime->tm_hour,ctime->tm_min,ctime->tm_sec);
        va_list s;
        va_start(s,format);
        char rightbuffer[SIZE];
        vsnprintf(rightbuffer,sizeof(rightbuffer),format,s);
        va_end(s);

        // 格式：默认部分+自定义部分
        char logtxt[SIZE*2];
        snprintf(logtxt,sizeof(logtxt),"%s %s\n",leftbuffer,rightbuffer);
        PrintLog(level,logtxt);  
    }
private:
    int PrintMethod;
    string path;
};

